Effects of Length and Inclination of Implants on Terminal Abutment Teeth and Implants in Mandibular CL1 Removable Partial Denture Assessed by Three-Dimensional Finite Element Analysis

Amir Fayaz, Alahyar Geramy, Yeganeh Memari, Zahra Rahmani, Amir Fayaz, Alahyar Geramy, Yeganeh Memari, Zahra Rahmani

Abstract

Objectives: This study sought to assess the effects of length and inclination of implants on stress distribution in an implant and terminal abutment teeth in an implant assisted-removable partial denture (RPD) using three-dimensional (3D) finite element analysis (FEA).

Materials and methods: In this in vitro study, a 3D finite element model of a partially dentate mandible with a distal extension RPD (DERPD) and dental implants was designed to analyze stress distribution in bone around terminal abutment teeth (first premolar) and implants with different lengths (7 and 10 mm) and angles (0°, 10° and 15°).

Results: Stress in the periodontal ligament (PDL) of the first premolar teeth ranged between 0.133 MPa in 10mm implants with 15° angle and 0.248 MPa in 7mm implants with 0° angle. The minimum stress was noted in implants with 10mm length with 0° angle (19.33 MPa) while maximum stress (25.78 MPa) was found in implants with 10mm length and 15° angle. In implants with 7 mm length, with an increase in implant angle, the stress on implants gradually increased. In implants with 10 mm length, increasing the implant angle gradually increased the stress on implants.

Conclusion: Not only the length of implant but also the angle of implantation are important to minimize stress on implants. The results showed that vertical implant placement results in lower stress on implants and by increasing the angle, distribution of stress gradually increases.

Keywords: Dental Implants, Single-Tooth; Dental Stress Analysis; Finite Element Analysis.

Figures

Fig. 1
Fig. 1
Mandibular model whit implant and RPD.
Fig. 2
Fig. 2
Finite element mesh
Fig. 3
Fig. 3
Gradual increase of stress on implant (7mm×4mm) by increase of angle.
Fig. 4
Fig. 4
Gradual increase of stress on implant (10mm×4mm) by increase of angle.
Fig. 5
Fig. 5
Stress contour

References

    1. Ohkubo C, Kobayashi M, Suzuki Y, Hosoi T. Effect of implant support on distal-extension removable partial dentures: in vivo assessment. Int J Oral Maxillofac Implants. 2008. Nov-Dec; 23 ( 6): 1095– 101.
    1. Wilson HJ, Mansfield MA, Heath JR, Spence D. Dental technology and materials for students. 8th ed. London: , Blackwell Scientific Publications; , 1987. : 364 .
    1. Jepson NJ, Thomason JM, Steele JG. The influence of denture design on patient acceptance of partial dentures. Br Dent J. 1995. April 22 ; 178 ( 8): 296– 300.
    1. Vermeulen AH, Keltjens HM, van't Hof MA, Kayser AF. Ten-year evaluation of removable partial dentures: survival rates based on retreatment, not wearing and replacement. J Prosthet Dent. 1996. September; 76 ( 3): 267– 72.
    1. Wetherell JD, Smales RJ. Partial denture failures: a long-term clinical survey. J Dent. 1980. December; 8 ( 4): 333– 40.
    1. Wills DJ, Mandersone RD. Biomechanical aspects of the support of partial dentures. J Dent. 1977. December; 5 ( 4): 310– 8.
    1. Picton DC, Wills DJ. Viscoelastic properties of the periodontal ligament and mucous membrane. J Prosthet Dent. 1978. September; 40 ( 3): 263– 72.
    1. Monteith BD. Management of loading forces on mandibular distal extension prostheses. Part I: Evaluation of concepts for design. J Prosthet Dent. 1984. November; 52 ( 5): 673– 81.
    1. Aydinlik E, Dayangac B, Celik E. Effect of splinting on abutment tooth movement. J Prosthet Dent. 1983. April; 49 ( 4): 477– 80.
    1. Rasmussen EJ. Alternative prosthodontic technique for tissue integrated prosthesis. J Prosthet Dent. 1987. February; 57 ( 2): 198– 204.
    1. Keltjens HM, Käyser AF, Hertel R, Battistuzzi PG. Distal extension removable partial dentures supported by implants and residual teeth: consideration and case reports. Int J Oral Maxillofac Implants. 1993; 8 ( 2): 208– 13.
    1. Todescan S, Lavigne S, Kelekis-Cholakis A. Guidance for the maintenance care of dental implants: clinical review. J Can Dent Assoc. 2012; 78: c107.
    1. Lee JY, Kim HY, Shin SW, Bryant SR. Number of implants for mandibular implant overdentures: a systematic review. J Adv Prosthodont. 2012. November; 4 ( 4): 204– 9.
    1. Karthikeyan I, Desai SR, Singh R. Short implants: A systematic review. J Indian Soc Periodontol. 2012. July; 16 ( 3): 302– 12.
    1. Keltjens HM, Kayser AF, Hertel R, Battistuzzi PG. Distal extension removable partial dentures supported by implants and residual teeth: Considerations and case reports. Int J Oral Maxillofac Implants. 1993; 8 ( 2): 208– 13.
    1. Sohrabi K, Mushantat A, Esfandiari S, Feine J. How successful are small-diameter implants? A literature review. Clin Oral Implants Res. 2012. May; 23 ( 5): 515– 25.
    1. Pommer B, Frantal S, Willer J, Posch M, Watzek G, Tepper G. Impact of dental implant length on early failure rates: A meta-analysis of observational studies. J Clin Periodontol. 2011. September; 38 ( 9): 856– 63.
    1. Romeo E, Bivio A, Mosca D, Scanferla M, Ghisolfi M, Storelli S. The use of short dental implants in clinical practice: literature review. Minerva Stomatol. 2010. Jan-Feb; 59 ( 1–2): 23– 31.
    1. Watanabe F, Hata Y, Komatsu S, Ramos TC, Fukuda H. Finite element analysis of the influence of implant inclination, loading position, and load direction on stress distribution. Odontology. 2003. September; 91 ( 1): 31– 6.
    1. Cehreli MC, Iplikçioglu H. In vitro strain gauge analysis of axial and off-axial loading on implant supported fixed partial dentures. Implant Dent. 2002; 11 ( 3): 286– 92.
    1. Geramy A. Alveolar bone resorption and the center of resistance modification (3-D analysis by means of the finite element method). Am J Orthod Dentofacial Orthop. 2000. April; 117 ( 4): 399– 405.
    1. Geramy A, Morgano SM. Finite element analysis of three designs of an implant-supported molar crown. J Prosthet Dent. 2004. November; 92 ( 5): 434– 40.
    1. Geramy A, Sharafodding F. Abfraction: 3D analysis using Finite Element Method. Quintessence Int. 2003. Jul-Aug; 34 ( 7): 526– 33.
    1. Geramy A, Faghihi S. Secondary trauma from occlusion: 3D analysis using Finite Element method. Quintessence Int. 2004. Nov-Dec; 35 ( 10): 835– 43.
    1. Lacerda TSP. Comportamento biomecânico das estruturas de suporte e da prótese parcial removível apoiada sobre implante na região distal [dissertação]. São Paulo: : Universidade de São Paulo; Faculdade de Odontologia ; 1999. .
    1. Birkan TO, Gurcan E, levent C, Volkan K. Insertion of Buccally tilted and placed Implants In edentulous atrophic posterior Mandibular sites. Biotechnol. & Biotechnol. Eq. 2012. January 1 ; 26 ( 4 ): 3163 – 6 .
    1. Darbar UR, Huggett R, Harrison A, Williams K. Finite element analysis of stress distribution at the tooth-denture base interface of acrylic resin teeth debonding from the denture base. J Prosthet Dent. 1995. December; 74 ( 6): 591– 4.
    1. Farah JW, Craig RG, Meroueh KA. Finite element analysis of a mandibular model. J Oral Rehabil. 1988. November; 15 ( 6): 615– 24.
    1. Ko CC, Chu CS, Chung KH, Lee MC. Effects of posts on dentin stress distribution in pulpless teeth. J Prosthet Dent. 1992. September; 68 ( 3): 421– 7.
    1. Sertgoz A, Gunever S. Finite element analysis of the effect of cantilever and implant length on stress distribution in an implant-supported fixed prosthesis. J Prosthet Dent. 1996. August; 76 ( 2): 165– 9.
    1. Aparicio C, Orozco P. Use of 5-mm-diameter implants: Periotest values related to a clinical and radiographic evaluation. Clin Oral Implants Res. 1998. December; 9 ( 6): 398– 406.
    1. Fields H, Jr, Campfield RW., Jr. Removable partial prosthesis partially supported by an endosseous blade implant. J Prosthet Dent. 1974. March; 31 ( 3): 273– 8.
    1. Watanabe F, Hata Y, Komatsu S, Ramos TC, Fukuda H. Finite element analysis of the influence of implant inclination, loading position, and load direction on stress distribution. Odontology. 2003. September; 91 ( 1): 31– 6.
    1. Himmlova L, Dostalova T, Kacovsky A, Konvickova S. Influence of implant length and diameter on stress distribution: a finite element analysis. J Prosthet Dent. 2004. January; 91 ( 1): 20– 5.
    1. de Freitas Santos CM, Pellizzer EP, Verri FR, de Moraes SL, Falcón-Antenucci RM. Influence of implant inclination associated with mandibular class I removable partial denture. J Craniofac Surg. 2011. March; 22 ( 2): 663– 8.
    1. Verri FR, Pellizzer EP, Rocha EP, Pereira JA. Influence of Length and Diameter of Implants Associated With Distal Extension Removable Partial Dentures. Implant Dent. 2007. September; 16 ( 3): 270– 80.

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